152 lines
4.8 KiB
C
152 lines
4.8 KiB
C
#include <rtthread.h>
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#include <sys/socket.h> /* 使用BSD socket，需要包含socket.h头文件 */
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#include "netdb.h"
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#define BUFSZ (1024)
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static const char send_data[] = "This is TCP Server from RT-Thread."; /* 发送用到的数据 */
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static void tcpserv(void *parameter)
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{
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char *recv_data; /* 用于接收的指针，后面会做一次动态分配以请求可用内存 */
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socklen_t sin_size;
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int sock, connected, bytes_received;
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struct sockaddr_in server_addr, client_addr;
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rt_bool_t stop = RT_FALSE; /* 停止标志 */
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int ret;
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recv_data = rt_malloc(BUFSZ + 1); /* 分配接收用的数据缓冲 */
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if (recv_data == RT_NULL)
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{
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rt_kprintf("No memory\n");
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return;
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}
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/* 一个socket在使用前，需要预先创建出来，指定SOCK_STREAM为TCP的socket */
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if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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{
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/* 创建失败的错误处理 */
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rt_kprintf("Socket error\n");
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/* 释放已分配的接收缓冲 */
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rt_free(recv_data);
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return;
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}
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/* 初始化服务端地址 */
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(5000); /* 服务端工作的端口 */
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server_addr.sin_addr.s_addr = INADDR_ANY;
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rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero));
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/* 绑定socket到服务端地址 */
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if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
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{
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/* 绑定失败 */
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rt_kprintf("Unable to bind\n");
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/* 释放已分配的接收缓冲 */
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rt_free(recv_data);
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return;
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}
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/* 在socket上进行监听 */
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if (listen(sock, 5) == -1)
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{
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rt_kprintf("Listen error\n");
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/* release recv buffer */
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rt_free(recv_data);
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return;
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}
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rt_kprintf("\nTCPServer Waiting for client on port 5000...\n");
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while (stop != RT_TRUE)
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{
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sin_size = sizeof(struct sockaddr_in);
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/* 接受一个客户端连接socket的请求，这个函数调用是阻塞式的 */
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connected = accept(sock, (struct sockaddr *)&client_addr, &sin_size);
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/* 返回的是连接成功的socket */
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if (connected < 0)
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{
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rt_kprintf("accept connection failed! errno = %d\n", errno);
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continue;
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}
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/* 接受返回的client_addr指向了客户端的地址信息 */
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rt_kprintf("I got a connection from (%s , %d)\n",
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inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
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/* 客户端连接的处理 */
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while (1)
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{
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/* 发送数据到connected socket */
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ret = send(connected, send_data, strlen(send_data), 0);
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if (ret < 0)
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{
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/* 发送失败，关闭这个连接 */
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closesocket(connected);
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rt_kprintf("\nsend error,close the socket.\r\n");
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break;
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}
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else if (ret == 0)
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{
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/* 打印send函数返回值为0的警告信息 */
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rt_kprintf("\n Send warning,send function return 0.\r\n");
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}
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/* 从connected socket中接收数据，接收buffer是1024大小，但并不一定能够收到1024大小的数据 */
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bytes_received = recv(connected, recv_data, BUFSZ, 0);
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if (bytes_received < 0)
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{
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/* 接收失败，关闭这个connected socket */
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closesocket(connected);
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break;
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}
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else if (bytes_received == 0)
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{
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/* 打印recv函数返回值为0的警告信息 */
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rt_kprintf("\nReceived warning,recv function return 0.\r\n");
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closesocket(connected);
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break;
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}
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/* 有接收到数据，把末端清零 */
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recv_data[bytes_received] = '\0';
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if (strcmp(recv_data, "q") == 0 || strcmp(recv_data, "Q") == 0)
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{
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/* 如果是首字母是q或Q，关闭这个连接 */
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closesocket(connected);
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break;
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}
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else if (strcmp(recv_data, "exit") == 0)
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{
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/* 如果接收的是exit，则关闭整个服务端 */
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closesocket(connected);
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stop = RT_TRUE;
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break;
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}
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else
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{
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/* 在控制终端显示收到的数据 */
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rt_kprintf("RECEIVED DATA = %s \n", recv_data);
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}
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}
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}
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/* 退出服务 */
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closesocket(sock);
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/* 释放接收缓冲 */
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rt_free(recv_data);
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return ;
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}
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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/* 输出tcpserv函数到finsh shell中 */
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FINSH_FUNCTION_EXPORT(tcpserv, startup tcp server);
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#endif
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